Blobs and row formats

It would seem that the dynamic or compressed row type would be the most performant for this, but this is only available in innodb barracuda.. Are there any plans to port it to xtradb?

Am I totally wrong about this? It would seem that the aim is to generally avoid overflow pages, and any blob bigger than 768 bytes spills over into an overflow with row type compact, which is what xtradb uses?